Number of results: 1,050

**Physical Science**

1. Which equation correctly shows beta decay? (A) 210/82 Pb -> 209/81 Tl + 0/-1 e + y (B) 210/82 Pb -> 209/83 Bi + 0/-1 e + y (C) 210/82 Pb -> 210/83 Tl + 0/-1 e + y (D) 210/82 Pb -> 210/83 Bi + y (E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y 2. The half-life if radon...

*November 18, 2013 by CJ*

**physics**

If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus? Hint: W = F*r F=kq1q2/r 2

*January 14, 2011 by Marty*

**Physics**

If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus? Hint: W = F*r F=kq1q2/r

*January 16, 2011 by Bobby*

**Physics**

If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus? Hint: W = F*r F=kq1q2/r

*January 16, 2011 by Lucy*

**Nuclear Physics**

If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus? Hint: W = F*r F=kq1q2/r 2

*January 13, 2011 by Marty*

**Nuclear Physics**

If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus? Hint: W = F*r F=kq1q2/r2

*January 16, 2011 by Jake*

**Chemistry**

Po-210 Ia an alpha emitter with a half-life of 138 days. how many grams of Po-210 remain after 552 days if the sample initially contained 5.80g of Po-210?

*October 20, 2014 by Shay*

**Math**

Expressed to the correct number of significant figures, the sum of two masses is 445.2 grams. WHich two masses produce this answer? 1) 210.10 g+235.100g 2)210.100 g + 235.10 g 3) 210.1 g + 235.1 g 4) 210.10 g+ 235.10 g I think the answer is 2 but I don't know the reason why.

*November 6, 2008 by Joanne*

**Physics**

While standing on a frictionless ice surface, a 50 kg skater pushes against a wall with an average force of 150 N west for 0.210 s. Calculate the velocity of the skater at 0.210 s. This was what i did: m = 50 kg Fnet = 150 N t = 0.210 s Vf =? Fnet = ma Fnet/m = a 150 N/50 kg...

*March 28, 2011 by bram*

**math**

Find the mean of the following set of numbers. 13, 15, 18, 18, 18, 19, 22, 26, 28, 33 is this correct? 13 15 18 18 18 19 22 26 28 + 33 =210 210/10=21

*July 25, 2009 by unknown*

**chemistry**

210 210 Pb --> Bi + ? 82 83 60 0 Co --> ? + e 27 -1 I need an explanation on how to find the missing product.

*April 6, 2011 by andrew*

**math**

Which one(s) of these twelve brands would be considered outliers, if there are indeed any at all? How extreme does something have to be considered an outlier? Brand,Strawberry,Vanilla 1,140,140 2,210,230 3,200,170 4,200,180 5,110,100 6,180,180 7,210,150 8,140,150 9,150,150 10,...

*November 14, 2013 by valerie*

**psy 2PSY/210 Psychology and Health Problems10**

I need help with an assignment for psy 210 i need to write about PSY/210 Psychology and Health Problems 1400 words any help would be greatly appreciated

*April 26, 2009 by Shannon*

**trig**

how do you solve Fcos29(degree)-210.308-0.58Fsin29=0 Solving for F? F(cos269-.58sin29)=210.308 F= 210.308/(cos269-.58sin29)

*March 14, 2007 by natash*

**integrated math**

Suppose a laboratory has a 26 g sample of polonium-210. The half-life of polonium-210 is about 138 days.?

*January 15, 2013 by sara*

**Chemistry**

Calculate the pH of the resulting solution if 21.0 mL of 0.210 M HCl(aq) is added to a) 26.0 mL of 0.210 M NaOH(aq) b) 31.0 mL of 0.260 M NaOH(aq)

*September 4, 2011 by Ada*

**advanced math**

If 0°<= 360°, solve the equation, sec x=-2 a. 150° and 210 ° b. 210° and 330° c. 120° and 240° d. 240° and 300° I believe it is C. am i right?

*May 28, 2009 by sophie*

**Science math**

Suppose a laboratory has a 38 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 1104 days? How much polonium is in the sample 1104 days later?

*January 7, 2013 by Joshua*

**math**

the dimensions of Gina's dining room table are represented by (3x-7) and (30-x). Find the perimeter 0f the table in terms of x. I did (3x-7)(-x+30) -3x^2+90x+7x-210 -3x^2+97x-210 Is this correct? Thanks for checking my work, I appreciate it

*November 27, 2013 by B8*

**science**

Suppose a laboratory has a 31 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 966 days? How much polonium is in the sample 966 days later?

*March 19, 2013 by Anonymous*

**sciencemath**

Suppose a laboratory has a 31 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 966 days? How much polonium is in the sample 966 days later?

*March 19, 2013 by Anonymous*

**statistics**

if a test has a mean of 150 and a standard deviation of 30, we know that: a)50% of the respondents scored between 180 and 210 b)68% of the responents scored above 120 c)50% of the respondents scored between 120 and 210 d) 96% of the respondents scored between 90 and 210

*November 21, 2012 by carly*

**math**

Ihave to evalaute expressions can someone tell me which whay is the correct way. 15+ 20 ÷ 5 Is 15 + 4= 19 or 5 ÷ 5=9 210-5 x 30 Is it 210-150=60 or 205 x30=61590 Have you heard of BEDMAS? it shows the correct order of operation in arithmetic B-brackets first E-exponents D M...

*April 27, 2007 by lacy*

**Chemistry**

In 2006, Soviet dissident Alexander Litvinenko was murdered when Polonium-210 was added to his tea; he died three weeks later. Polonium-210 is an alpha emitter. What other product is formed?

*April 7, 2016 by Jessie*

**math**

A local photocopying store advertises as follows. " We charge 9 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 210 , and 3 cents per copy for each copy 210 and above. " Let x be the number of copies ordered and C(x) be the cost of ...

*February 12, 2014 by Clara*

**Chemistry**

The reaction 2NO + Cl2 <==> 2NOCl has Kc= 210 what is the equilibrium concentration of NO in moles per liter given the following Cl2= .46 NOCl= .43M at equilibrium. So far all ive gotten is 210= [.43]^2/[.46][NO]^2 where do I go from here please

*March 12, 2008 by Lauren*

**Alebra**

need to solve a word problem using linear equation in slope form. Ben walks 3 miles per hour, and runs at 6 miles per hour. Runs and walks a total of distance of 210 miles per week. Is this correct 210 = 3/6m +b - equation to show relation of hours run to walk B. is Ben runs ...

*September 7, 2013 by aaron*

**algebra**

Consider that the half-life of Polonium-210 is 140 days.What approximate daily percentage of decay does Polonium-210 demonstrate?% (Round to two decimals.)(Hint: use the Rule of 70 backwards by dividing by the half-life period instead of the rate.) What percentage of the ...

*October 1, 2015 by Tristan*

**math**

A $300 mountain bike is discounted by 30% and then discounted an additional 10% for shoppers who arrive before 5am. If you go to the store at 4:30 am, how much will you pay? I did 300^30 =90. 300 -90 ==210 ^ 10 =2.10. 210-2.10= 207.90. Is this correct?

*March 25, 2015 by sam*

**Chemistry H**

60.0 grams of Th-210 with a half life of 50,000 years is allowed to decay for 250,000 years. How much of the original quantity remains? In addition, Th-210 decays via beta emission. Write the equation for its transmutation.

*June 20, 2013 by c*

**Science collage**

A jetliner lands at speed of 210 km/h and breaks at rate of 20 km/h/s . If the jatliner travels at a constant speed of 210 km/h for 1s after landing before applying the breakes . What is the total displacement of the jetliner between couchdown on the runway and coming to rest ?

*January 4, 2012 by Aisha*

**math**

What is the interest on $600 for 5 years is $210.What is the percentage rate? 600 x rate x 5 yrs = 210. Solve for rate, then multiply by 100.

*November 11, 2006 by nae*

**math check**

Round 210,290,290,290.21029 to the nearest ten million 210,300,000,000

*February 16, 2014 by Gio*

**MAT 116**

A moon is about 210,000 miles from the planet it orbits. Write in scientific notation. If a rocket traveled at 3 x 10^4 miles per hour, how long would it take for it to reach the moon from the planet? Write the number 210,000 in scientific notation. 210,00 = It would take the ...

*September 25, 2012 by CC*

**Math**

17.The speed limit of a highway is 55 miles per hour. A car is traveling at least 65 miles per hour. How many miles per hour m over the speed limit is the car traveling? 55 – m ≥ 65; m ≥ 10 m + 65 ≤ 55; m ≤–10 65 – m ≤ 55; m ≤ 10 55 + ...

*January 13, 2016 by Cami*

**Chemistry**

2 NO(g) + 2 H2(g) --> N2(g) + 2 H2O(g) Reactant Concentration(mol/L) and Rate of Appearance of N2 [NO] [H2] (mol/L·s) 0.420 0.122 0.136 0.210 0.122 0.0339 0.210 0.244 0.0678 0.105 0.488 0.0339 What is the rate constant?

*May 15, 2011 by Kat*

**math**

If a stone is tossed from the top of a 210 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 210, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest ...

*June 20, 2011 by Taina*

**physics**

A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 40.0 min at 85.0 km/h, 12.0 min at 95 km/h, and 35.0 min at 30.0 km/h, and spends 35.0 min eating lunch and buying gas. Determine the average speed for the ...

*September 13, 2011 by Anonymous*

**chemistry**

What is the pH of a solution prepared by dissolving 8.40 g of aniline hydrochloride C6H5NH3Cl in 750 mL of 0.210 M aniline,C6H5NH2? i kno to use the ph = pka + log (base/acid). getting pka isnt the issue, but what do i put into the log (base/acid)? (0.210/????) thanks

*April 7, 2010 by anonymous*

**chemistry**

What is the pH of a solution prepared by dissolving 8.40 g of aniline hydrochloride C6H5NH3Cl in 750 mL of 0.210 M aniline,C6H5NH2? i kno to use the ph = pka + log (base/acid). getting pka isnt the issue, but what do i put into the log (base/acid)? (0.210/????)

*April 8, 2010 by anonymous*

**Please Help Me!**

The Edmonton rush is one of nine teams that play in the national lacrosse league. The weights of the 2013 Edmonton rush players are shown. Weight in Lbs. 160. 170. 170. 175. 180 185. 188. 190. 190. 190 194. 195. 200. 200. 200 205. 205. 210. 210. 210 210. 215. 245. A.) Explain ...

*June 20, 2016 by Courtney B.*

**Math(Please Help Me, Assignment Due)**

The Edmonton rush is one of nine teams that play in the national lacrosse league. The weights of the 2013 Edmonton rush players are shown. Weight in Lbs. 160. 170. 170. 175. 180 185. 188. 190. 190. 190 194. 195. 200. 200. 200 205. 205. 210. 210. 210 210. 215. 245. A.) Explain ...

*June 20, 2016 by Courtney B.*

**Physics**

A child bounces in a harness suspended from a door frame by three elastic bands. (a) If each elastic band stretches 0.210 m while supporting a 7.35-kg child, what is the force constant for each elastic band? (b) What is the time for one complete bounce of this child? (c) What ...

*February 5, 2016 by Bust Nuttington*

**Physics**

A child bounces in a harness suspended from a door frame by three elastic bands. (a) If each elastic band stretches 0.210 m while supporting a 7.35-kg child, what is the force constant for each elastic band? 114.33 N/m (b) What is the time for one complete bounce of this child...

*February 8, 2016 by Jesse*

**Physical Science**

Balancing Decay Reactions. Fill in the blank with the correct piece to balance the decay equation. 1. (184/74) W (4/2) He + _____ 2. (210/82) Pb______+ (206/80) Hg 3. (35/16) S (0/-1) e + _______ 4. ________ (0/-1) e + (60/28) Ni My work: 5. (...

*December 19, 2014 by DFD*

**Physics**

A satellite of mass 210 kg is launched from a site on Earth's equator into an orbit at 210 km above the surface of Earth. (a) Assuming a circular orbit, what is the orbital period of this satellite? (b) What is the satellite's speed in its orbit? (c) What is the minimum energy...

*November 24, 2010 by tom*

**Chemistry**

Here is my question and I,m hoping I worked the problem out correctly. A 10-g mass of krypton occupies 15.0 L at a pressure of 210 kPa. Find the volume of the krypton when the pressure is increased to 790 kPa. V2 = V1 x P1/P2 V2 = 15.0 L x 210 kPa/790 kPa = 3.98 L or rounded 3...

*May 8, 2012 by Amy*

**Math1**

Post a New QuestionCurrent Questions Homework Help: Please Help Me! Posted by Courtney B. on Monday, June 20, 2016 at 4:20pm. The Edmonton rush is one of nine teams that play in the national lacrosse league. The weights of the 2013 Edmonton rush players are shown. Weight in ...

*June 20, 2016 by Cherie*

**tax accounting**

purchased a bond on August 15, 2012 for $2,100. $200 of the purchase price represented accrued interest. She received $210 in interest income on the bond on December 1, 2012. What is the proper treatment of the $210 interest income for federal income tax purposes?

*April 14, 2013 by tim*

**Math**

In how many different ways can six of ten people be seated in a row of six chairs? I don't have the answer, but from my rough understanding of permutations and combinations, I got: 10C6 * 6! = 210 * 6! I figure first 6 people have to be chosen out of the 10, and that can be ...

*September 26, 2016 by Ray*

**Math for Ms. Sue please last questions**

2. In a school of 464 students, 89 students are in the band, 215 students are on sports teams, and 31 students participate in both activities. How many students are involved in neither band nor sports? (1 point) 160 students 191 students 249 students 433 students 3. In a ...

*March 8, 2013 by Delilah*

**Math**

having trouble figuring out this problem. During the first 4 wks of school, a cafeteria worker made more than 840 tacos. She made the same number of tacos each week. Which inequality best represents t, the number of tacos she made during 1 week. a. t > 410 b. t < 410 c. ...

*March 12, 2013 by Brandi*

**coomon factors**

I don't understand common factors. can someone show me how to find the greatest common factor of 385 and 1365? 385 = 5 x 7 x 11 1365 = 3 x 5 x 7 x 13 which factors are found in both? 5 x 7 so 35 is the HCF, (it's like taking the intersection of the elements of two sets) There ...

*April 18, 2007 by kim*

**chilcare**

An Individual Family's Account Receivable date Descrip Debit Credit Balance Jan 5 Week 90.00 90.00 Jan 12 " 150.00 ----- Jan 16 Payment 180.00 ----- Jan 19 Week 150.00 ----- 1- What was the family's balance after paying you on Jan.16? A $0 B $ 240 C $ 60 D $ 420 2- What is the...

*December 16, 2009 by Abbie*

**prealgebra/ check answer please**

If 1,790 Mega Watts of power, out of the 3,000 Mega Watts generated by a power utility, reach the destination, what percentage of the generated power reaches its destination? 1,790 - 3,000 = 1,210 1,790 divided by 1,210 = 1.4 Answer 1.4% Unsure

*June 23, 2012 by toni*

**Math**

In a marketing survey involving 1,000 randomly chosen people, it is found that 630 use brand P, 420 use brand Q, and 210 use both brands. How many people in the survey use brand P and not brand Q? Answer choices: 210 people 420 people 630 people none of these

*March 27, 2014 by Helena*

**trigonometry**

(a) If è is in standard position, then the reference angle è is the acute angle formed by the terminal side of è and the ---Select--- x-axis y-axis . So the reference angle for è = 120° is è = ?°, and that for è = 210°is è = ? degrees. (b) If è is any angle, the ...

*September 12, 2015 by lovelady7*

**Math**

In a marketing survey involving 1,000 randomly chosen people, it is found that 630 use brand P, 420 use brand Q, and 210 use both brands. How many people in the survey use brand P and not brand Q? Answer choices: 210 people 420 people 630 people none of these is it 630?

*March 22, 2015 by M*

**math**

Is 70.21 = 7.210 ?

*September 5, 2009 by Kaleb*

**Statistics**

An insurance sales representative selects 4 policies to review. The group of policies she can select from contains 10 life policies, 5 automobile policies, and 3 homeowners policies. Find the probability of selecting all life policies. The number of ways to select all life ...

*May 3, 2012 by Ambra*

**Algebra 2**

210= 84/(R1/2+R1/3) solve for R1 How do I do this

*July 22, 2009 by Gary*

**Math**

what is 210-x=100 ?

*February 21, 2011 by Jazmine*

**Algebra**

7 Permutation 3 is: Is it 210?

*May 16, 2014 by Anonymous*

**Dividing Radicals Problem!!**

Divide the following radical and simplify the answer. ((-3-2√48))/((14√50-8)) A.(24+210√2+64√3+560√6)/(-9736) B.(12+105√2+32√3+280√6)/(-4868) C.(12+105√2+32√3+280√6)/4868 D. (24+210√2+64√3+560√...

*February 11, 2014 by Brady*

**algebra**

plans, under plan A, Giselle would have to pay the first 130 dollars of her nedical bills plus 35% of the rest. Under plan B Giselle would pay the first 210 dollars but only 20% of the rest. for what amount of medical bills will plan B save Giselle money? assume she has over ...

*March 28, 2010 by ron*

**Math Help!!!**

15. A survey about the student government program at a school finds the following results: 110 students like the program. 120 students think the program is unnecessary. 210 students plan on running for student government next year. If a circle graph were made from this data, ...

*April 8, 2016 by Nausicca*

**IP address assignment**

Imagine that you are a system administrator for a company, and that the company operates from two locations Phoenix and Boston. Phoenix has 350 hosts and Boston has 2100. Given that the following class C IP addresses have been assigned to your company as a whole by ICANN: 220....

*September 14, 2011 by Francesca*

**math**

1,115 is what percent of 210

*August 24, 2008 by s.d*

**hca 210**

measuring Quality

*August 16, 2009 by rochelle*

**integrated math**

Solve 210 = 6b + y for y .

*January 10, 2011 by gabby*

**IT/210**

object-oriented design

*September 30, 2012 by Anonymous*

**Maths**

(210-150)+ [9×10+(-5×2)]-100

*January 6, 2016 by Lubna Shaikh*

**Fraction reduce**

210/10 reduced =?

*February 13, 2017 by Violet*

**math**

Write 0.21 as a percent. A) 0.21% B) 2.1% C) 210% D) 21% is the answer D

*March 1, 2008 by Sue*

**math**

Evaluate the permutation. P(7, 4) a. 1 b. 210 c. 7 d. 840

*May 4, 2008 by Dana*

**Psy 210**

what is Sternberg's Theory of Love

*June 26, 2009 by ms lane*

**Mat 115**

1155 is what percent of 210?

*September 6, 2009 by Marsha*

**math**

Fraction simplest 12 over 210

*September 25, 2011 by bri*

**Math**

Simplify each of the following. 1. 42/48 2. -15/35 3. 119/210

*November 12, 2013 by Alan*

**Mat**

Express 210 as the product of primes

*September 3, 2015 by Noor*

**math**

where do the parenthesis go for 5x4+3x6=210

*September 12, 2016 by celeste*

**HCA 210**

What are the disadvantages to having a solo practice?

*May 27, 2009 by Meshelle*

**Trig**

4sin^2x-1=0 Are the angles 30, 120, and 210 and 300?

*January 11, 2010 by Tara*

**Trig**

4sin^2x-1=0 Are the angles 30, 120, and 210 and 300?

*January 11, 2010 by Tara*

**HCA 210**

what are two positive patient outcomes

*June 27, 2010 by Mari*

**math 5 grade**

longest multiplication combination for 210

*September 13, 2010 by zahra*

**math**

multipling to get 210 with more than two numbers

*November 3, 2010 by arjel*

**maths**

If there are 210 raisins in a packet how many peanuts should be there?

*February 9, 2017 by Landy*

**chem**

0.210 mole of Na2CO3 in 200.0 mL of solution

*February 19, 2017 by Anonymous*

**algebra**

c=210+c Huh? Not possible for any c If x is any number and p is any positive value, then x + p > x.

*September 17, 2006 by lacey*

**Math grade 6**

2 ---- 104 3 ---- 158 4 ---- 210 x ----? Write expression

*October 4, 2007 by Deb*

**psy 210**

how might michael's situation illustrate adjustments

*March 5, 2009 by patiance*

**Math**

If <BFA=3r+12 and m<= -8+210, find m<AFE. How do you work this out?

*August 30, 2009 by Jillian*

**hca/210**

what is one strength in the u.s. health care system?

*March 23, 2010 by Anonymous*

**Science**

How many days will it take for 3/4 of a sample of polonium 210 to decay?

*January 6, 2011 by Diane*

**Algebra**

If the principal P=$600, the interest I=210.00, and the T= 5 Years. What is the rate?

*September 4, 2012 by Sue Jackson*

**math**

longest multipcation combination for 120 180 and 210

*September 4, 2013 by marco*

**chem**

How many chloride ions are present in 65.5 mL of 0.210 M AlCl3 solution

*February 11, 2015 by Anonymous*

**pre-calculus**

Choose the point on the terminal side of -210°.

*July 13, 2016 by Gabb7*

**Math**

How do you write 210,004,050 in standard form?

*August 28, 2016 by Jan*